netdev - Re: [PATCH net-XXX] vhost-vdpa: fix use after free in vhost_vdpa

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Date: Wed, 1 Nov 2023 01:33:10 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Bo Liu <liubo03@...pur.com>, Jason Wang <jasowang@...hat.com>,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-XXX] vhost-vdpa: fix use after free in
 vhost_vdpa_probe()

On Fri, Oct 27, 2023 at 03:12:54PM +0300, Dan Carpenter wrote:
> The put_device() calls vhost_vdpa_release_dev() which calls
> ida_simple_remove() and frees "v".  So this call to
> ida_simple_remove() is a use after free and a double free.
> 
> Fixes: ebe6a354fa7e ("vhost-vdpa: Call ida_simple_remove() when failed")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

queued, thanks!

> ---
>  drivers/vhost/vdpa.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 9a2343c45df0..1aa67729e188 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -1511,7 +1511,6 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
>  
>  err:
>  	put_device(&v->dev);
> -	ida_simple_remove(&vhost_vdpa_ida, v->minor);
>  	return r;
>  }
>  
> -- 
> 2.42.0